Pharmacogenomic Study in Patients of Lung, Colorectal and Head/Neck Cancers Receiving Chemotherapy

The purpose of this study is to look at several genes that might determine how the body processes the drugs used to treat lung, colorectal and head and neck cancers. The goal of this examination is to help investigators determine the proper dosage to give future cancer patients or to better predict which future patients will respond to particular drug therapies.